JPWO2017104345A1 - Rotating electrical machine assembly apparatus and rotating electrical machine manufacturing method - Google Patents

Abstract

Provided is an assembly device for a rotating electrical machine capable of assembling a stator core composed of a plurality of divided cores while maintaining high roundness. An assembly apparatus for a rotating electrical machine includes a shaft member, a plurality of movable iron cores provided around the shaft member and movably in a radial direction, and an electromagnet portion having an excitation winding. It arrange | positions at the inner peripheral part of the stator core comprised by a some division | segmentation core, and attracts | sucks a division | segmentation core to an inner peripheral side by supply of an exciting current.

Description

  The present invention relates to a rotating electrical machine assembly apparatus and a rotating electrical machine manufacturing method.

  The electric power steering (EPS) system includes an EPS / ECU (Engine Control Unit), various sensors such as a torque sensor, and an EPS motor for reducing steering force. The EPS motor includes a stator, a rotor, a winding, and a housing. The stator includes a stator core in which divided cores are arranged in an annular shape, and windings wound around the divided cores, and is fixed to the inner surface of the housing.

As a method for fixing the stator core to the housing, the following method is known.
The split core is adsorbed on the outer peripheral surface of a jig having an electromagnet function. The lower housing that covers the lower surface of the split core is adsorbed to the lower surface of the jig. An opening through which the jig is inserted is provided at the center of the lower housing. An upper housing that fits into the lower housing is attached to the upper surface of the jig from the upper surface side of the split core. The upper housing is formed with a flange portion having a spring property for preventing damage to the split core. The jig is removed, and the upper and lower housings are integrated by welding or the like (for example, see Patent Document 1).

JP 2007-189783 A

  In the method described in Patent Document 1, each divided core is attracted to the outer peripheral surface of a jig having an electromagnet function. The inner peripheral surface of the stator core in which the divided cores are arranged in an annular shape has variations in tolerance. If the inner diameter of the stator core is smaller than the outer diameter of the jig, the split core cannot be arranged in an annular shape. Therefore, it seems that the outer diameter of the jig is set to the minimum value of the tolerance of the stator core so that the inner diameter of the stator core is always larger than the outer diameter of the jig. For this reason, when each divided core is adsorbed on the outer peripheral surface of the jig, a gap is locally formed between the divided core and the jig. That is, the inner peripheral surface of the stator core in which the divided cores are arranged in an annular shape is elliptical and has no roundness.

According to the first aspect of the present invention, an assembly apparatus for a rotating electrical machine includes a shaft member, a plurality of movable iron cores provided around the shaft member and movably in a radial direction, and an excitation winding. The electromagnet part is arranged on an inner peripheral part of a stator core composed of a plurality of divided cores, and attracts the divided cores to the inner peripheral side by supplying an excitation current.
According to a second aspect of the present invention, a method for manufacturing a rotating electrical machine is a method for manufacturing a rotating electrical machine including a stator and a housing, and uses the rotating electrical machine assembly apparatus described in the first aspect and the like. And a step of fitting the stator, which is expanded by heating, to the stator in a state where the divided core is attracted to the inner peripheral side by the electromagnet portion.

  According to the present invention, since the split core is attracted to the inner peripheral side in a state where the split core is arranged on the outer periphery of the electromagnet portion, it is possible to assemble the stator core constituted by the split core while maintaining high roundness. It becomes.

The side view of 1st Embodiment which illustrates the rotary electric machine by this invention produced using the assembly apparatus of a rotary electric machine as an electric power steering motor. FIG. 2 is a cross-sectional view of the motor illustrated in FIG. 1. FIG. 3 is a perspective view of the split core illustrated in FIG. 2. The schematic diagram for demonstrating the method of assembling a housing and a stator core using the assembly apparatus of the rotary electric machine by this invention. (A)-(C) is the figure seen from the side which shows the process of assembling a housing and a stator core, respectively. Sectional drawing for demonstrating operation | movement of the electromagnet part at the time of attracting | sucking a stator core. The figure which looked at the assembly apparatus of the rotary electric machine shown in Drawing 6 from the upper part. (A) is typical sectional drawing for demonstrating the reference position after the shrinkage fitting of a housing and a stator core, (B) is an enlarged view of the area | region VIIIB of (A). Sectional drawing which shows 2nd Embodiment of the assembly apparatus of the rotary electric machine by this invention.

-First embodiment-
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a first embodiment illustrating a rotating electric machine according to the present invention, which is manufactured using an assembly apparatus for a rotating electric machine, as an electric power steering motor.
The electric power steering (EPS) system includes an EPS motor (hereinafter simply referred to as a motor) 100, an ECU (Engine Control Unit) (not shown), and various sensors such as a torque sensor. In the present embodiment, only the motor 100 configured by integrating the ECU and the electromechanical unit is illustrated.
The motor 100 has a housing 2 in which motor components are accommodated. The motor 100 has a shaft 6 serving as a rotating shaft. One end of the shaft 6 protrudes from the housing 2, and the pulley 1 is fixed to the protruding portion. Although not shown, the pulley 1 is connected to a gear drive unit of the EPS system by a belt, thereby constituting a power transmission mechanism.

  A magnetic pole sensor 3, a U-phase terminal 20u, a V-phase terminal 20v, and a W-phase terminal 20w protrude from a surface opposite to the surface of the housing 2 from which the pulley 1 protrudes. The U-phase, V-phase, and W-phase terminals 20u, 20v, and 20w are attached to the bus bar mold 14 (see FIG. 2) and are electrically connected to the ECU. The magnetic pole sensor 3 detects the magnetic pole position of the motor 100.

FIG. 2 is a cross-sectional view of the motor 100 illustrated in FIG.
As described above, the shaft 6 is disposed at the center of the motor 100, and the pulley 1 is fixed to one end of the shaft 6, that is, the left end in the illustrated example. A rotor 31, that is, an F rotor core 12 and an R rotor core 13 are provided at a substantially central portion of the shaft 6 in the axial direction in the housing 2. An F magnet 12m and an R magnet 13m are attached to the F / R rotor cores 12 and 13, respectively. The outer periphery of the F magnet 12m and the R magnet 13m is covered with a magnet cover. An F bearing 7 that rotatably supports the shaft 6 is disposed between the pulley 1 and the F rotor core 12. An R bearing 8 that rotatably supports the shaft 6 is disposed on the other end side of the shaft 6 opposite to the pulley 1.

The F bearing 7 is supported by the housing 2. The housing 2 has a substantially cylindrical shape that is open on the side opposite to the surface that supports the F bearing 7. The opening of the housing 2 is sealed by a bearing holder 9 fixed to the housing 2 with a bevel-type retaining ring 10. The R bearing 8 is integrated with the bearing holder 9 or supported by the bearing holder 9. A stator 32 including the stator core 4 and the coil 5 is disposed on the outer periphery of the rotor 31. The coil 5 is wound around the stator core 4 to form a three-phase winding. A gap is provided between the rotor 31 and the inner peripheral surface of the stator core 4 of the stator 32. The stator core 4 and the housing 2 are fixed by shrinkage fitting.
The stator core 4 is configured in an annular shape by connecting a plurality of divided cores 40 to each other at adjacent sides. Details of this structure will be described later.

FIG. 3 is a perspective view of the split core 40 shown in FIG.
All the split cores 40 have the structure shown in FIG. For example, in an 8-pole 12-slot concentrated winding motor, the stator core 4 is composed of 12 divided cores 40.
The split core 40 is formed by laminating electromagnetic ropes, and has an inner peripheral portion 41 and an outer peripheral portion 42, and an intermediate portion 43 that connects the inner peripheral portion 41 and the outer peripheral portion 42. The inner peripheral surface 41a of the inner peripheral portion 41 and the outer peripheral surface 42a of the outer peripheral portion 42 are each formed in an arc shape. The circumferential length of the outer circumferential portion 42 is greater than the circumferential length of the inner circumferential portion 41. Further, the circumferential length of the intermediate portion 43 is smaller than the circumferential lengths of the inner circumferential portion 41 and the outer circumferential portion 42. The coil 5 is wound around the intermediate portion 43. A groove 47 that extends linearly in the axial direction is formed on the outer peripheral surface 42 a of the outer peripheral portion 42.

  A fitting convex portion 44a, a fitting concave portion 45b, and a fitting convex portion 44c are formed on one side portion (the left side portion) of the outer peripheral portion 42. The fitting convex portion 44a and the fitting convex portion 44c have different lengths in the axial direction. A fitting recess 45a, a fitting protrusion 44b, and a fitting recess 45c are formed on the other side of the outer peripheral portion 42 (on the right side). The fitting recess 45a and the fitting recess 45c have different axial lengths. The fitting convex portions 44a to 44c and the fitting concave portions 45a to 45c each have a U-shape or a V-shape protruding or immersing in the circumferential direction. The fitting convex portion 44a, the fitting concave portion 45b, and the fitting convex portion 44c of one divided core 40 are respectively provided with the fitting concave portion 45a, the fitting convex portion 44b, and the fitting concave portion 45c of the divided core 40 adjacent thereto. Will fit. Further, the fitting concave portion 45a, the fitting convex portion 44b, and the fitting concave portion 45c of one divided core 40 are respectively provided with the fitting convex portion 44a, the fitting concave portion 45b, and the fitting convexity of the divided core 40 adjacent thereto. The part 44c is fitted.

  As described above, the adjacent split cores 40 are connected by fitting the fitting convex portions 44 a to 44 c and the fitting concave portions 45 a to 45 c, and the twelve divided cores 40 temporarily form the annular stator core 4. Assembled. The adjacent split cores 40 are connected in a state in which movement in the axial direction is restricted because the concave portions and the convex portions of the respective side portions formed in a three-step stepped structure are fitted. Further, since the fitting convex portions 44a to 44c and the fitting concave portions 45a to 45c are each U-shaped or V-shaped protruding or immersing in the circumferential direction, the movement in the radial direction is restricted. Connected to As described above, the split core 40 is simply fitted with the fitting convex portions 44a to 44c and the fitting concave portions 45a to 45c provided on the respective side portions without using a joining means such as welding. It can be connected in a state in which movement in the axial direction and the radial direction is restricted.

Further, the fitting convex portion 44a and the fitting convex portion 44c, and the fitting concave portion 45a and the fitting concave portion 45c have different lengths in the axial direction. Therefore, each split core 40 constitutes a foolproof mechanism that prevents the split cores 40 from being fitted in the axial direction, that is, the up-down direction when they are fitted together.
A method of shrink-fitting the stator core 4 temporarily assembled by connecting the divided cores 40 to the housing 2 will be described.

FIG. 4 is a schematic view for explaining a method of assembling the housing and the stator core using the rotating electrical machine assembling apparatus according to the present invention.
With reference to FIG. 4, the outline | summary of the method of shrink-fitting the housing 2 and the stator core 4 using the assembly apparatus 50 is demonstrated.
The assembling apparatus 50 includes a base 51, a column 52, a stator core support part 53, and an electromagnet part 60. In addition, the assembling apparatus 50 includes a holding ring 57. The electromagnet unit 60 includes a plurality of movable iron cores 61 and excitation windings 62. The stator core support portion 53 is a member formed in a ring shape, and is fixed to the base 51 at the base portion so that the tip end portion thereof is in contact with the lower end surface of the stator core 4 in which the split core 40 is temporarily assembled. Yes. The base 51, the support column 52, the stator core support portion 53, and the electromagnet portion 60 constitute an integrally assembled electromagnet assembly 55. The retaining ring 57 is separated from the electromagnet assembly 55.

The holding ring 57 has a ring shape, and the lower side of the outer peripheral portion is a large diameter portion 58. A stepped portion 58a is formed at the upper end of the large diameter portion. In order to shrink-fit the housing 2 and the stator core 4, as described above, the split cores 40 are connected in an annular shape and the stator core 4 is temporarily assembled. Hereinafter, an example of a method for temporarily assembling the stator core 4 by connecting the split cores 40 in an annular shape will be described. Two split core arrangement jigs (not shown) having six protrusions into which the grooves 47 (see FIG. 3) of the split core 40 are fitted are prepared. Each divided core 40 is fitted with the fitting convex portions 44a to 44c and the fitting concave portions 45a to 45c on the side portions of the adjacent divided cores 40. In this state, the groove 47 of each divided core 40 is divided into the divided cores. Fits into the protruding part of the arrangement jig. In this way, six divided cores 40 are arranged in each of the divided core arrangement jigs. The six divided cores 40 connected are removed from each divided core arrangement jig. The split cores 40 on one end side and the other end side of each of the two sets of split core connected bodies composed of the six split cores 40 connected to each other are connected. Thereby, the stator core 4 in which the twelve divided cores 40 are connected in an annular shape is temporarily assembled.
Note that the above is merely an example, and other methods may be used to provisionally assemble the stator core 4.

  In this way, the retaining ring 57 is fitted to the outer peripheral surface of the stator core 4 in which the split core 40 is temporarily assembled. As shown in FIG. 4, the holding ring 57 is arranged at an intermediate position in the axial direction of the stator core 4 with the large-diameter portion 58 facing downward. Then, the stator core 4 supported by the holding ring 57 and temporarily assembled with the split core 40 is placed on the upper surface of the stator core support portion 53 of the electromagnet assembly 55. An inlay portion 59 (see FIG. 6) is provided on the upper peripheral edge of the holding ring 57.

  On the other hand, the housing 2 is heated and expanded to a predetermined diameter for shrink fitting. The housing 2 is held by a retainer of a pressure device (not shown), and the inlay portion 38 (see FIG. 6) of the housing 2 is aligned with the inlay portion 59 of the holding ring 57. The housing 2 is pushed down by the pressure device, and the holding ring 57 fitted to the outer periphery of the stator core 4 in which the split core 40 is temporarily assembled is moved downward. When the housing 2 reaches a predetermined position in the axial direction with respect to the stator core 4, the holding ring 57 is detached from the stator core 4. Thereafter, the housing 2 is cooled, so that the housing 2 and the stator core 4 are pressure-welded by shrinkage fitting.

FIGS. 5A to 5C are views seen from the side showing the process of assembling the housing and the stator core, respectively.
FIG. 5A shows a state in which the housing 2 is held above the stator core 4 in which the split core 40 is temporarily assembled. The stator core 4 in which the split cores 40 are temporarily assembled has its lower end surface placed on the upper surface of the stator core support portion 53 in a state where the holding ring 57 is fitted to the outer periphery. At this time, no exciting current flows through the electromagnet portion 60, and a gap is formed between the inner peripheral surface of the stator core 4 in which the split core 40 is temporarily assembled and the outer peripheral surface of the movable iron core 61 of the electromagnet portion 60. Details of this will be described later. The pressure device (not shown) is driven to move the housing 2 downward, and the inlay portion 38 of the housing 2 is aligned with the inlay portion 59 of the holding ring 57 as described above. When the housing 2 is pushed down in this state, the lower end surface of the housing 2 comes into contact with the stepped portion 58 a of the holding ring 57. Further, when the housing 2 is pushed down, the holding ring 57 fitted to the outer periphery of the stator core 4 in which the split core 40 is temporarily assembled is moved downward together with the housing 2. FIG. 5B shows this state. Although details will be described later, in the state shown in FIG. 5B, the split cores 40 constituting the stator core 4 in which the split cores 40 are temporarily assembled by passing an exciting current through the electromagnet part 60 are respectively electromagnet parts 60. Has been sucked into. Thereby, the stator core 4 has an annular shape having a high roundness.

  When the housing 2 is pushed downward from the state of FIG. 5B, the holding ring 57 is detached from the stator core 4 and falls to the base 51. This state is shown in FIG. In this state, no exciting current flows in the electromagnet portion 60, and a gap is provided between the stator core 4 and the electromagnet portion 60 as in the state shown in FIG.

  Thereafter, a cooling gas such as air is blown into the housing 2 by a blower or the like. The housing 2 is cooled, and the housing 2 and the stator core 4 are pressure-welded by shrinkage fitting. When the temperature of the housing 2 drops to some extent, the housing 2 on which the stator core 4 is shrink-fitted is lifted and separated from the electromagnet assembly 55. And the press-contact joining strength of the housing 2 by which the stator core 4 was shrink-fitted, that is, the holding force is confirmed. Even after the housing 2 in which the stator core 4 is shrink-fitted is moved from the assembling apparatus 50, cooling air is blown to the electromagnet portion 60. By doing in this way, the excessive temperature rise of the electromagnet part 60 can be prevented. In addition, it is possible to operate the electromagnet unit 60 at a constant temperature, and it is possible to perform stable shrink fitting with small dimensional variations.

FIG. 6 is a cross-sectional view for explaining the operation of the electromagnet portion when attracting the stator core. FIG. 7 is a view of the rotating electrical machine assembly apparatus shown in FIG. 6 as viewed from above.
FIG. 6 shows a state in which the housing 2 is pushed down from above the stator core 4 so that the inlay portion 38 of the housing 2 is aligned with the inlay portion 59 of the holding ring 57.
First, the details of the structure of the electromagnet portion 60 of the electromagnet assembly 55 will be described.
The plurality of movable iron cores 61 of the electromagnet unit 60 are arranged radially from the support column 52 as shown in FIG. In FIG. 7, the movable iron core 61 is exemplified as a structure having twelve as many as the split cores 40. As shown in FIG. 6, the movable iron core 61 has an upper horizontal portion 61a, a lower horizontal portion 61b, and a vertical portion 61c that connects the inner end of the upper horizontal portion 61a and the inner end of the lower horizontal portion 61b. ing. A bobbin 63 having a U-shaped cross section formed in an annular shape is provided on the inner periphery of the movable iron core 61 arranged radially. An excitation winding 62 is wound inside the bobbin 63.

  The support column 52 is provided with a stepped portion 52a. An electromagnet holding flange 66 is attached to the step portion 52 a of the support column 52. A lower support pin 39b is fixed to the electromagnet holding flange 66. The lower support pin 39 b passes through a through hole provided in the lower horizontal portion 61 b of the movable iron core 61 and fixes the lower end portion of the bobbin 63. The upper horizontal portion 61a of the movable iron core 61 is provided with a through hole through which the upper support pin 39a is inserted. The upper support pin 39 a passes through the through hole of the upper horizontal portion 61 a of the movable iron core 61 and fixes the upper end portion of the bobbin 63. The upper and lower support pins 39a and 39b are disposed between the split cores 40 as shown in FIG. Therefore, in the illustrated example, the upper and lower support pins 39a and 39b are provided in the same number as the divided core 40, respectively. As will be described later, each movable iron core 61 is disposed on the electromagnet holding flange 66 so as to be movable in the radial direction with the upper and lower support pins 39a and 39b as guides.

  On the upper end side and the lower end side of the vertical portion 61c of each movable iron core 61, return springs 37a and 37b are stretched, respectively. That is, each movable iron core 61 is urged toward the inner peripheral side by the return springs 37 a and 37 b, and the inner peripheral surface of the vertical portion 61 c abuts on the outer peripheral surface of the support column 52 when no exciting current flows. ing. The return springs 37a and 37b are formed, for example, by forming a coil spring into a ring shape and joining the start end and the end end.

  A restriction ring 36 is provided on the upper end side of each movable iron core 61. The restriction ring 36 is supported by the upper support pin 39a. The restriction ring 36 is a metal ring-shaped member, for example, and is formed of a member that does not deform in the radial direction. Each movable iron core 61 is restricted from moving outward from a position where the outer peripheral surface of the vertical portion 61 c contacts the inner peripheral surface of the restriction ring 36. That is, the maximum outer diameter of the movable iron core 61 of the electromagnet part 60 is set by the diameter of the inner peripheral surface of the restriction ring 36. Thus, each movable iron core 61 has a position where the inner peripheral surface of the vertical portion 61c contacts the outer peripheral surface of the support column 52, and a position where the outer peripheral surface of the vertical portion 61c contacts the inner peripheral surface of the regulating ring 36. It is arranged on the electromagnet holding flange 66 so as to be movable in the radial direction. The bobbin 63 is fixed to the electromagnet holding flange 66 by the upper and lower support pins 39a and 39b, and does not move even if the movable iron core 61 moves. Therefore, the excitation winding 62 wound around the bobbin 63 is always fixed at a predetermined position.

As shown in FIG. 6, a coil 5 is wound around each divided core 40 constituting the stator core 4. In FIG. 6, the lead wire of the coil 5 is on the lower side.
FIG. 6 shows a state in which the driving state of the electromagnet unit 60 is different between the left side and the right side with the central axis of the support column 52 as a boundary. The left side of the central axis toward FIG. 6 shows a state where no current is flowing through the excitation winding 62 of the electromagnet unit 60. The right side of the central axis toward FIG. 6 shows a state in which current is flowing through the excitation winding 62 of the electromagnet unit 60.

  In a state where the current is not passed through the excitation winding 62 of the electromagnet portion 60 and on the left side of the central axis, each movable iron core 61 is biased toward the inner peripheral side by the return springs 37a and 37b, and the inner periphery of the vertical portion 61c. The surface is in contact with the outer peripheral surface of the support column 52. That is, the outer diameters of the plurality of movable iron cores 61 constituting the electromagnet portion 60 are the smallest. In this state, the outer diameter of the movable iron core 61 of the electromagnet part 60 is smaller than the inner diameter of the stator core 4 (which is formed by the inner peripheral surface 41a of the divided core 40) in which the divided cores 40 are temporarily assembled. A gap is provided between the outer peripheral surface of the plurality of movable iron cores 61 and the inner diameter of the stator core 4. Therefore, the stator core 4 in which the split core 40 is temporarily assembled can be fitted to the outer peripheral side of the electromagnet portion 60 in a non-contact manner. Although there is a possibility that contamination occurs when the electromagnet part 60 and the stator core 4 come into contact with each other, according to the present embodiment, contamination due to contact between the electromagnet part 60 and the stator core 4 can be prevented.

  In addition, although direct current can be used as the exciting current of the electromagnet unit 60, there is a possibility that magnetization remains in the movable iron core 61. Thereby, there is a possibility that the return of the movable iron core 61 by the return springs 37a and 37b may be hindered. In such a case, you may make it operate the electromagnet part 60 by an alternating current.

In the state where the inlay portion 38 of the housing 2 is aligned with the inlay portion 59 of the holding ring 57, as described above, a gap is provided between the outer peripheral surface of the electromagnet portion 60 and the inner diameter of the stator core 4. ing. When the housing 2 is pushed down in this state, the state shown in FIG.
In this state, when an exciting current is passed through the exciting winding 62 of the electromagnet unit 60, that is, when an exciting current is supplied to the exciting winding 62, the state shown on the right side of the central axis in FIG.
That is, first, each movable iron core 61 is attracted to the stator core 4 in which the split cores 40 are temporarily assembled, and moves on the electromagnet holding flange 66 in the outer circumferential direction. At this time, the electromagnet unit 60 is set to generate a force larger than the urging force of the return springs 37a and 37b. Each movable iron core 61 is restricted from moving in the outer circumferential direction by the regulating ring 36 at a position where the outer circumferential surface is in contact with the inner circumferential surface of the regulating ring 36.

  Then, each divided core 40 constituting the stator core 4 is attracted to the electromagnet portion 60, that is, each movable iron core 61, and moves to the inner peripheral side. That is, the housing 2 is fitted to the outer periphery of the stator core 4, and the holding ring 57 is moved below the stator core 4 while the housing 2 is pushed down in the axial direction to advance the fitting between the housing 2 and the stator core 4. At this time, each of the divided cores 40 forming the stator core 4 is attracted by the electromagnet portion 60 and moves to the inner peripheral side, thereby increasing the roundness of the stator core 4. As described above, the housing 2 is fitted to the outer periphery of the stator core 4 in a state where each divided core 40 is attracted by the electromagnet portion 60 and the roundness of the stator core 4 is increased, and shrink fitting is performed. . Therefore, the stator core 4 formed by the split core 40 can be assembled in a state where high roundness is maintained without fixing the plurality of split cores 40 constituting the stator core 4 by a mechanical coupling method such as welding.

  The exciting current flowing through the exciting winding 62 has a proportional relationship with the attractive force of the stator core 4. Therefore, the excitation current supplied to the excitation winding 62 is determined based on the force required for the stator core 4 to hold a perfect circle. Further, by making the exciting current constant, the attractive force can be made constant even with respect to a temperature change such as a temperature rise of the exciting winding 62.

  As shown in FIG. 5C, when the holding ring 57 is detached from the stator core 4 and dropped on the base 51, the supply of the excitation current is stopped, so that the attractive force of the electromagnet unit 60 is lost. For this reason, each movable iron core 61 returns to the original position shown on the left side from the central axis of FIG. 6 by the urging force of the return springs 37a and 37b. Thereafter, cooling air is blown to cool the housing.

  Although not shown, the coil 5 comprises, for example, a u-phase, v-phase, and w-phase three-phase winding, and the coil 5 is welded to a bus bar connected to the terminals 20u, 20v, and 20W of each phase. Connected by The coil 5 and the bus bar are preferably welded after the shrink fitting is completed in order to easily and accurately perform the shrink fitting between the stator core 4 formed by the split core 40 and the housing 2. However, this method is not specific.

FIG. 8A is a schematic cross-sectional view for explaining a reference position after completion of shrink fitting between the housing and the stator core, and FIG. 8B is an enlarged view of a region VIIIB in FIG. 8A. is there.
In the present embodiment, the axial reference position P0 in the stator core 4 is set with the end face position P1 on the opening side of the housing 2 as a reference. That is, the reference position P0 of the stator core 4 is set to a predetermined dimension position in the axial direction from the end face position P1 on the opening side of the housing 2. Since the stator core 4 is formed by laminating electromagnetic steel plates and the like, variations occur in the thickness in the axial direction, in other words, in the laminating direction. When the reference position P0 of the stator core 4 is set as described above, variations occur in the gap between the stator core 4 and the inner surface of the bottom 2a opposite to the opening side of the housing 2. In the present embodiment, even when the thickness of the stator core 4 reaches the maximum tolerance, a gap is formed between the upper surface 4a of the stator core 4 and the inner surface 2a of the bottom of the housing 2 in the axial direction, as shown in FIG. 8B. S was provided. Thus, it can be determined whether or not the joining force due to shrink fitting of the housing 2 and the stator core 4 satisfies a specified value. This will be described below.

  For example, an EPS motor or the like requires a holding force converted into the axial direction several times the maximum torque. In order to confirm whether or not the joining force between the housing 2 and the stator core 4 satisfies the holding force converted in the axial direction, an inspection is performed one by one at the time of shipment. This inspection is performed by pushing the outer peripheral portion (core back portion) of the stator core 4 in the X direction of FIG. At this time, the pushing force is a value obtained by converting the required holding force torque into an axial force, and it is determined whether or not the prescribed value is satisfied by pushing the core back portion with this force. As in the above embodiment, in the axial direction, if a gap S is provided between the upper surface 4a of the stator core 4 and the inner surface 2a of the bottom of the housing 2, depending on whether or not the stator core 4 moves in the axial direction, It can be determined whether or not the required holding force torque is satisfied. That is, an efficient inspection can be performed in which the stator core 4 is a non-defective product if the stator core 4 does not move in the X direction and is defective if the stator core 4 is moved.

According to the first embodiment of the present invention, the following effects can be obtained.
(1) The assembling apparatus 50 includes an electromagnet part 60. The electromagnet part 60 is arranged on the inner peripheral part of the stator core 4 constituted by a plurality of split cores 40, and is supplied with an excitation current, whereby split cores are provided. 40 is sucked to the inner peripheral side. When the split core 40 is attracted to the electromagnet portion 60, the roundness of the stator core 4 is increased, and is shrink-fitted in this state. Therefore, it is possible to assemble a stator core composed of a plurality of divided cores 40 while maintaining high roundness. As a result, the stator core can be used as an assembly device such as an EPS motor that requires high roundness.

(2) The assembling apparatus 50 includes return springs 37 a and 37 b that urge the movable iron core 61 in a direction to reduce the diameter so that the outer diameter of the movable iron core 61 is smaller than the inner diameter of the stator core 4. For this reason, the temporarily assembled stator core 4 can be fitted to the outer peripheral side of the electromagnet portion 60 in a non-contact manner. Thereby, generation | occurrence | production of the contamination by the electromagnet part 60 and the stator core 4 contacting can be suppressed.

(3) The assembling apparatus 50 includes a restriction ring 36 that restricts the movable iron core 61 from moving to the outer peripheral side at a predetermined position. Thereby, the movable iron core 61 can be attracted to the stator core 4 by the attractive force of the electromagnet portion 60 against the urging force of the return springs 37 a and 37 b and moved to a position regulated by the regulating ring 36. For this reason, when the stator core 4 is fitted to the outer periphery of the electromagnet portion 60, the outer diameter of the movable core 61 is smaller than the outer diameter of the stator core 4 in which the split core 40 is temporarily assembled. When each divided core 40 constituting 4 is attracted to the electromagnet part 60, the outer diameter of the movable iron core 61 can be made larger than that to increase the attractive force.

(4) The assembling apparatus 50 includes a holding ring 57 that is fitted to the outer periphery of the stator core 4 constituted by the split cores 40 so as to be movable in the axial direction and holds the outer peripheral surface of the stator core 4. For this reason, the outer peripheral surfaces of the plurality of split cores 40 constituting the stator core 4 can be made circular by the retaining ring 57, and the operation of fitting the housing 2 to the outer periphery of the stator core 4 can be made easy and efficient. . Further, since the radial positions of the plurality of split cores 40 can be aligned in advance, the roundness of the stator core 4 after shrink fitting can be increased.

(5) The assembly device 50 includes a base 51 and a stator core support portion 53 that is provided on the base 51 and supports the stator core 4. As a result, the axial reference position P 0 of the stator core 4 is set on the mounting surface of the stator core support portion 53. Accordingly, if the pressing amount or the pressing stop position is set in the pressurizing device that presses down the housing 2, the position of the reference position P0 of the stator core with respect to the end face position P1 of the housing 2 is determined. As a result, the axial reference position P0 of the stator core 4 can be accurately determined.

-Second Embodiment-
FIG. 9 is a sectional view showing a second embodiment of the rotating electrical machine assembling apparatus according to the present invention.
The assembly device 50 according to the second embodiment includes an upper restriction ring 36a and a lower restriction ring 36b as restriction rings that restrict the movement of the movable iron core 61 to the outer peripheral side at a predetermined position.
The upper restriction ring 36a is supported by the upper support pin 39a, like the restriction ring 36 of the first embodiment.
The lower regulating ring 36b is fixed to the upper side of the electromagnet holding flange 66, in other words, the side where the movable iron core 61 is disposed.

Other configurations in the second embodiment are the same as those in the first embodiment.
Accordingly, the second embodiment also has the same effects as the effects (1) to (5) of the first embodiment.
In addition, in the second embodiment, the movement of the movable iron core 61 toward the outer peripheral side is restricted at both the upper and lower ends of the movable iron core 61, so that the distance from each split core 40 constituting the stator core 4 is the upper and lower ends. It can be ensured that the sides are almost identical. Thereby, the attraction | suction force to each division | segmentation core 40 can be arrange | equalized uniformly, and there exists an effect that the roundness of the stator core 4 can be raised more.

  In the above embodiment, the assembling apparatus 50 is exemplified as a structure including the holding ring 57 that holds the outer peripheral surface of the split core 40 constituting the stator core 4 in advance before shrink fitting. It is important that the outer peripheral surface of the split core 40 is supported by the retaining ring 57 in this way for a motor that requires high roundness in the stator core 4 such as an EPS motor. However, if the motor is not an EPS motor that does not require a very high roundness as the roundness of the stator core 4, the holding ring 57 that supports the outer peripheral surface of the split core 40 is not necessary. When the holding ring 57 is not used, the stator core 4 temporarily assembled with the split core 40 is directly placed on the stator core support portion 53 of the electromagnet assembly 55 so that the housing 2 is fitted to the outer periphery of the stator core 4. You can do it.

  In the embodiment described above, the movable iron core 61 is exemplified as a structure in which the same number 12 of the split cores 40 are provided. However, the number of movable iron cores 61 may be larger or smaller than this. If the number of movable iron cores 61 is reduced, the number of upper and lower support pins 39a and 39b is reduced, and the structure is simplified. However, since the movable iron core 61 sucks the opposed divided cores 40, when the number of movable iron cores 61 is smaller than the number of the divided cores 40, one movable iron core 61 sucks one or more divided cores 40. It should be noted that it will be.

  In the said embodiment, it illustrated as a structure which urges | biases the movable iron core 61 to the inner peripheral side with the return springs 37a and 37b. However, other structures such as a structure in which a permanent magnet is provided on the support 52 to attract the movable iron core 61 may be used. In short, it is only necessary to provide a return mechanism that urges the movable iron core 61 in the direction of reducing the diameter.

  In the above embodiment, the restriction ring 36 or the upper / lower restriction rings 36a and 36b for restricting the maximum outer diameter of the movable iron core 61 of the electromagnet portion 60 is exemplified as the ring-shaped member. However, the restriction ring 36 or the upper / lower restriction rings 36 a and 36 b may be provided only on the lower restriction ring 36 b and provided integrally with the electromagnet holding flange 66. Alternatively, as described above, the number of movable iron cores 61 may be smaller than the number of split cores 40 and each movable iron core 61 may be biased by a tension spring. In short, it is only necessary to have a movement restricting mechanism for restricting the maximum outer diameter of the movable iron core 61.

  As described above, the assembling apparatus 50 of the present invention can be used as an assembling apparatus 50 for motors other than EPS motors. The assembling apparatus 50 of the present invention can be used not only as a motor but also as an assembling apparatus 50 for a rotating electrical machine such as a generator / motor. Moreover, in the above, it illustrated as a method of fixing the stator core 4 and the housing 2 by shrink fitting. However, the stator core 4 and the housing 2 may be fixed by press-fitting using the assembling apparatus 50 of the present invention.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

2 Housing 4 Stator Core 5 Coil 31 Rotor 32 Stator 36 Regulating Ring 36a Upper Regulating Ring 36b Lower Regulating Ring 37a Return Spring 37b Return Spring 40 Divided Core 50 Assembly Device 51 Base 52 Support Column 53 Stator Core Supporting Unit 57 Holding Ring 60 Electromagnet Unit 61 Movable iron core 62 Excitation winding 100 Motor

Claims (8)

A shaft member;
A plurality of movable iron cores provided around the shaft member and movably in the radial direction, and an electromagnet part having an excitation winding,
The electromagnet portion is disposed on an inner peripheral portion of a stator core composed of a plurality of divided cores, and is an assembly device for a rotating electrical machine that attracts the divided cores toward the inner peripheral side when an excitation current is supplied. The assembly apparatus for a rotating electrical machine according to claim 1,
An assembly apparatus for a rotating electrical machine, further comprising a return mechanism that urges the movable core in a direction to reduce the diameter so that the outer diameter of the movable core is smaller than the inner diameter of the stator core. The assembly apparatus for a rotating electrical machine according to claim 1,
The movable iron core is provided so as to be movable to the outer peripheral side when the excitation current is supplied, and further includes a movement restricting mechanism for restricting the movable iron core from moving to the outer peripheral side at a predetermined position. Assembly equipment for rotating electrical machines. The assembly apparatus for a rotating electrical machine according to claim 1,
An assembly apparatus for a rotating electrical machine, further comprising a holding ring that is fitted to the outer periphery of the stator core constituted by the divided cores so as to be movable in the axial direction and holds the outer peripheral surface of the stator core. The rotating electrical machine assembly apparatus according to claim 4,
Furthermore, the assembly apparatus of a rotary electric machine provided with a base and the stator core support part which is provided in the said base and supports the said stator core. A method of manufacturing a rotating electrical machine including a stator and a housing,
Using the rotating electrical machine assembly apparatus according to any one of claims 1 to 5, the housing that is expanded by heating in the stator core in a state where the divided core is attracted to the inner peripheral side by the electromagnet portion. A method of manufacturing a rotating electrical machine including a step of fitting. A method of manufacturing a rotating electrical machine including a stator and a housing,
Using the rotating electrical machine assembly apparatus according to claim 2, by applying an exciting current to the electromagnet portion, the biasing force of the return mechanism that biases the movable iron core in a direction to reduce the diameter is used. A method of manufacturing a rotating electrical machine comprising a step of moving a movable iron core toward the stator core. A method of manufacturing a rotating electrical machine including a stator and a housing,
6. The rotating electrical machine assembly apparatus according to claim 5, wherein the stator core is supported by the stator core support portion, the housing is fitted to the outer periphery of the stator core, and the housing is pushed down in the axial direction to A method of manufacturing a rotating electrical machine, comprising a step of moving the holding ring below the stator core while progressing fitting with the stator core.

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